What changed or was decided

The High Court of Australia established the authoritative legal test for determining what constitutes an “inherent requirement” of a job. Under Australian employment and anti-discrimination laws, an employer can lawfully terminate or refuse to hire a worker if, because of a protected characteristic (such as age or disability), the worker cannot perform these essential requirements.

In Qantas Airways Ltd v Christie [1998] HCA 18, the High Court decided that the inherent requirements of a job are not confined to the physical or technical tasks a worker performs. Instead, they must be determined by looking at the practical reality of the employer’s business operations and the commercial context of the role. The court ruled that if a position cannot be performed without breaching international laws or operational restrictions, then meeting those restrictions is an inherent requirement of the role.

Key facts

• The Worker: John Christie was a highly experienced Boeing 747 captain employed by Qantas Airways.
• The Rule: Qantas had a policy requiring pilots to retire at age 60, aligning with the “Rule of 60” established by the International Civil Aviation Organization (ICAO). This rule banned pilots aged 60 or older from flying over the airspace of many foreign countries.
• The Termination: When Mr Christie turned 60, Qantas terminated his employment, arguing he was legally barred from piloting flights to key international destinations, such as the United States and Singapore.
• The Dispute: Mr Christie brought a claim alleging unlawful termination based on age discrimination. He argued that the physical ability to fly the aircraft was the only inherent requirement of his role, and that Qantas could roster him exclusively on routes that did not have the age-60 restriction.
• The Appeal: After Mr Christie won his case in the industrial relations court, Qantas appealed the decision to the High Court of Australia.

Law or legal principle

At the heart of this case was the interpretation of the Industrial Relations Act 1988 (Cth), which prohibited employers from terminating employment based on age, unless the termination related to the “inherent requirements of the particular position.”

The legal principle established by the High Court is that an inherent requirement is something essential to the position, rather than something peripheral or accidental.

Crucially, the court rejected a narrow, purely physical interpretation of a worker’s duties. As established in this decision, the legal test requires an objective analysis of the entire employment arrangement, including:

• The physical and technical tasks the worker is hired to perform.
• The operational, regulatory, and commercial environment in which the employer operates.
• The terms of the employment contract.

Under this principle, if a regulatory or legal restriction prevents a worker from performing a substantial part of their duties, complying with that restriction becomes an inherent requirement of the job. As detailed below, employers cannot be legally forced to restructure their entire business operations or create a modified, restricted role to accommodate a worker who can no longer meet these essential operational requirements.

Decision or outcome

The High Court of Australia ruled in favour of Qantas, overturning the previous decision and finding that the termination of Mr Christie’s employment did not constitute unlawful age discrimination.

The court held that being under the age of 60 was an inherent requirement of Mr Christie’s position as a B747 captain. The majority concluded that because Qantas operated a global international airline, it required its captains to have complete geographical flexibility to fly to any destination on its international network.

As Mr Christie was legally barred by the ICAO rule from flying to countries that represented the vast majority of Qantas’s international destinations, he could not fulfil the inherent requirements of his specific position. Forcing Qantas to roster him exclusively on limited, unrestricted routes would place an unreasonable operational and financial burden on the airline. Consequently, his termination was deemed lawful under the Act.

What it means in practice

For workers, delegates, and union organisers, the Christie decision provides a critical framework for handling workplace disputes involving discrimination, medical capacity, and professional qualifications. The ruling means that a worker’s capacity to do a job must be assessed against the real-world operational needs of the employer, not just the basic tasks listed in a position description.

When advising members or contesting a dismissal based on a lack of capacity, representatives should consider the following practical applications:

• Look beyond the physical tasks: If an injured or older worker can still physically perform their core duties, they may still be lawfully dismissed if regulatory, legal, or essential operational barriers prevent them from doing the job in the way the business requires.
• Assess the degree of flexibility: Employers are not legally required to permanently alter the fundamental nature of a role or create a completely new, restricted position to accommodate a worker. However, minor or temporary roster adjustments may still be expected depending on the size of the employer and modern award or enterprise agreement obligations. (Specific accommodation requirements should be confirmed against the current award or agreement.)
• Examine the “particular position”: The inherent requirements must relate to the specific job the worker was hired to do, not a generalised category of work. If a worker can be easily redeployed or if the restriction only impacts a minor, peripheral part of their day-to-day duties, the employer cannot claim those tasks are “inherent” to the role.
• Evidence-based arguments: In negotiations or tribunals, unions must challenge employers who try to use “inherent requirements” as a convenient excuse to terminate workers. The employer must objectively prove that the restriction fundamentally undermines their business operations, rather than just causing minor administrative inconvenience.

Sources

• Qantas Airways Ltd v Christie [1998] HCA 18
• Industrial Relations Act 1988 (Cth)